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New aspects of improving the performance of WO3 thin films for photoelectrochemical water splitting by tuning the ultrathin depletion region

机译：通过调整超薄耗尽区改善光电化学水分裂WO3薄膜性能的新方面

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摘要

In this work, we explored a facile, scalable and effective method for substantially enhancing photocurrent and incident-photon-to-current efficiency of WO3 thin-film photoanodes by a mild reduction treatment under low oxygen pressure. Experimental data from photoelectrochemical and electrochemical impedance spectroscopies have shown that such treatment can increase the charge carrier density on WO3 photoanode surfaces resulting in improvements in hole collection efficiency and reduction in charge recombination. Despite a much thinner layer of WO3 (about 500 nm) compared to those in other published studies, the electrodes exhibited an ultra-high photocurrent density of 1.81 mA cm(-2) at 1.23 V vs. RHE. This current density is one of the highest ones among WO3-based photoanodes described in literature. The proposed surface modulation approach offers an effective and scalable method to prepare high-performance thin film photoanodes for photoelectrochemical water splitting.
机译：在这项工作中，我们探讨了通过低氧气压力的轻度还原处理基本上提高了WO3薄膜光阳极的光电流和入射光子至电流效率的容纳，可扩展和有效的方法。 来自光电子化学和电化学阻抗谱的实验数据表明，这种处理可以增加WO3光电码表面上的电荷载体密度，从而提高空穴收集效率和电荷重组的降低。 尽管与其他公布研究中的那些相比，尽管与其他出版研究中的那些相比，但是，电极在1.23V与Rhe下表现出1.81mA cm（-2）的超高光电流密度。 该电流密度是文献中描述的基于WO3的光阳极中的最高的密度之一。 所提出的表面调制方法提供了一种有效且可扩展的方法，用于制备用于光电化学水分裂的高性能薄膜光电彩色。

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  • 来源
    《RSC Advances》 |2019年第2期|共7页
  • 作者

    Cen Jiajie; Wu Qiyuan; Yan Danhua; Zhang Wenrui; Zhao Yue; Tong Xiao; Liu Mingzhao; Orlov Alexander;

  • 作者单位

    SUNY Stony Brook Dept Mat &

    Sci Engn Stony Brook NY 11794 USA;

    SUNY Stony Brook Dept Mat &

    Sci Engn Stony Brook NY 11794 USA;

    SUNY Stony Brook Dept Mat &

    Sci Engn Stony Brook NY 11794 USA;

    Brookhaven Natl Lab Ctr Funct Nanomat Upton NY 11973 USA;

    SUNY Stony Brook Dept Chem Stony Brook NY 11794 USA;

    Brookhaven Natl Lab Ctr Funct Nanomat Upton NY 11973 USA;

    Brookhaven Natl Lab Ctr Funct Nanomat Upton NY 11973 USA;

    SUNY Stony Brook Dept Mat &

    Sci Engn Stony Brook NY 11794 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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